Robert friedel



(No Model.)

R. FRIEDEL,

GLASS GRINDING MACHINE. No. 474,119. Patented MayS, 1892.

UNITED STATES PATENT OFFICE.

ROBERT FRIEDEL, OF STUTTGART, GERMANY. Y

GLASS-GRINDING MACHINE.

SPECIFICATION forming part of Letters Patent No. 474,119, dated May 3, 1892. Application filed May 2, 1891- Serial No. 391,359- (No model.)

To whom it may concern.-

Be it known that I, ROBERT FRIEDEL, a citizen of the Kingdom of Wiirtemberg, residing at Stuttgart, W'iirtemberg, Empire of Germany, have invented a new and useful Improvement in Glass-Grinding Machines, of which the following is a specification.

The object of my present improvement is to support and grasp a large number of quadrangular glass plates at once and to grind them simultaneously.

The accompanying drawings represent, in Figure 1, a vertical section, and in Fig. 2, a plan, of a machine embodying my said invention.

The glass plates 99 are placed side by side and closely together into the clamping-frame A, and are held tightly at the side or edge to be ground by the clamping-strip 0. At their rear edges these plates rest upon the backstop, preferably in the shape of a shouldered strip B, which is adjustable in the slots of the clamping-frame, whereby by means of the scale a, formed on the frame, the length and breadth to which the plates are to be ground may be accurately determined. It will be noted that the strip 0 and the back-stop B extend entirely across the machine and each consists of a single continuous strip. The back stop is, moreover, provided with a straight-edge or shoulder against which the glasses to be ground rest. This arrangement enables me to simultaneously grind a large number of glasses of the smallest size desired. It will be noted, moreover, that the clamping-strip C and back-stop B are separate and independently mounted, removable, and adjustable. By this arrangement I am onabled to first accurately align the glasses with respect to the back-stop before clamping the same by'the clamping-strip'C.

The clamping-frame A is pivoted in the points of the screws 61 or their pivots. These pivots or pivot-screws are in turn supported or j ournaled in carriages D, and adjustable in the supports S by means of an adjustingscrew .9, j ournaled in the supports S and threaded in the carriages D. The frames A, as shown, may thus be brought into a more or less inclined position with respect to the abrading-wheel or grindstone G, whereby the angle of the bevel to be imparted may be varied at pleasure.

The carriages D, as well as their supports S and the adj listing-screws s, it will be observed, are separate for each side of the machine. By this arrangement each end of the glassclamping frame can be independently adjusted With relation to the abrading-Wheel. The clamping-frame can consequently be at all times accurately adjusted to its proper position of parallelism with relation to the abrading-wheel, which would not be the case if the said clampingframe were mounted in one carriage only and adjustable at one point only.

The two sliding weights g on the clampingframe serve to regulate the pressure of the plates 19 on the grindstone. The set-screw a on the carriage D is adjusted so that when the desired bevel has been attained the clamping-frame A strikes against the said setscrew, thereby preventing any further pressure of the frame A with the glass plates 19 against the grindstone.

Those surfaces of the clamping-frame A, the shouldered strip B, and the clamping-strip O which come into contact with the glass plates are covered with rubber.

What I claim, and desire to secure by Letters Patent, is-

1. In a grinding-machine, a clamping-frame, in combination with a clamping-strip, as O, and a shouldered back-stop, as B, both the back-stop and clamping-strip extending entirely across the frame, substantially as set forth.

2. In a grinding-machine, the combination, with an abradin -wheel, of separate supports, as S, separate carriages supported thereon, and separate means for adjusting the carriages toward or away from the abrading' wheel, and aclamping-frame mounted on the carriages, substantially as set forth.

3. In a grindingunachine, the combination of an abrading-wheel and supporting-frames, as S, with carriages and adj usting-screws, as s, a pivoted clam ping-frame, and stops mounted in the carriages for limiting the downward motion of the pivoted clamping-frames, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

ROBERT FRIEDEL.

Witnesses:

AUGUST 13. DRANTZ, ANT. HERRMANN. 

